Protective helmet shell



FIG. 1 is a top perspective view of a protective helmet shell showing my new design;

FIG. 2 is a front elevation view of FIG. 1;

FIG. 3 is a rear elevation view of FIG. 1;

FIG. 4 is a top plan view of FIG. 1;

FIG. 5 is a bottom plan view of FIG. 1;

FIG. 6 is right side elevation view of FIG. 1; and,

FIG. 7 is a left side elevation view of FIG. 1.

The details shown in broken lines are for illustrative purposes only and form no part of the claimed design. 

CLAIM The ornamental design for a protective helmet shell, as shown and described. 